The Impact of Nonlinear HPA on the Determination of the Impulse Sample Power in IP-OFDM Systems

Power boosting factor determination in impulse postfix‐OFDM‐based positioning system

“…Moreover, for the case of single snapshot in ULAA, we obtain the estimation result of ULAA element number effect on AOA estimation accuracy. Taking CRLB as reference I ∈ [6,7] is considered as the optimum compromise interval, which achieves decent AOA accuracy with relatively low system complexity. From another perspective, the gap between BER-biased and positioningbiased PBF is so tiny that it is unadvisable to adopt large PBF at the risk of BER deterioration caused by PAPR and power assignment issues for achieving insignificant accuracy improvement.…”

“…In our previous work [7], adopting TOA information and AOA information positioning scheme with IP-OFDM systems is proposed to estimate 2D position coordinates of targets. The characteristic that the impulse sample S is supposed as the greatest amplitude than any other samples in IP-OFDM system is investigated for TOA estimation.…”

“…With the assumption that the total transmit power is fixed, the accuracy of channel estimation can be enhanced by increasing the power of impulse sample, which will benefit the communication quality; nevertheless, if relatively high power was assigned on the impulse sample, the BER performance of IP-OFDM system will likely be degraded because the power distributed to data samples is insufficient; meanwhile, huge amplitude of IP will aggravate peak-to-average power ratio (PAPR) issue, which is a common problem in OFDM system [3][4][5]. Thus, PBF determination has been paid much attention as an important issue in IP-OFDM system [2,6,7]. For instance, in [6], a nonlinear high power amplifier (HPA) and nonideal predistorter are considered in a practical IP-OFDM system, and the impact of nonlinear HPA on the determination of the PBF of IP and the BER performance are analyzed.…”